| Model Year | 2009 | 2023 | |
| Model | Infiniti FX | Audi A8 / S8 | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr SUV | 4dr Sedan, ext. | |
| Difference | |||
| Wheelbase | 113.5 in | 123.1 in | -9.6 in |
| Length | 191.3 in | 209.5 in | -18.2 in |
| Width | 75.9 in | 76.6 in | -0.7 in |
| Height | 65.0 in | 58.3 in | 6.7 in |
| Curb Weight | 4094 lb. | 4762 lb. | -668 lb. |
| Fuel Capacity | 23.8 gal. | 21.7 gal. | 2.1 gal. |
| Headroom, Row 1 | 39.3 in | 38.3 in | 1 in |
| Shoulder Room, Row 1 | 57.3 in | 59.1 in | -1.8 in |
| Hip Room, Row 1 | 54.9 in | 0.0 in | 54.9 in |
| Legroom, Row 1 | 44.7 in | 41.5 in | 3.2 in |
| Headroom, Row 2 | 38.5 in | 38.5 in | 0 in |
| Shoulder Room, Row 2 | 57.4 in | 57.6 in | -0.2 in |
| Hip Room, Row 2 | 54.2 in | 0.0 in | 54.2 in |
| Legroom, Row 2 | 34.6 in | 44.3 in | -9.7 in |
| Total Legroom | 79.3 in (over 2 rows) | 85.8 in (over 2 rows) | -6.5 in |
| Cargo Volume, Minimum | 24.8 ft3 | 12.5 ft3 | 12.3 ft3 |
| Cargo Volume, Maximum | 62.0 ft3 | 12.5 ft3 | 49.5 ft3 |
| 2009 Infiniti FX Seat Room and Comfort: Pros | ||
| Year | Body/Powertrain | Comment |
| 2008 | 4dr SUV 275-horsepower 3.5L V6 5-speed shiftable automatic AWD |
Longest drive was 6 hours and had no discomfort whatsoever. Have ridden for 4 hours in a Toyota Rav4 and was almost in pain after an hour. see full Infiniti FX review |
None of our members have yet commented on the seat room and comfort of the 2023 Audi A8 / S8.